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krw

In article ,
zz says...
In article .com,
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krw wrote:
The shower in my master bathroom is no longer staying hot. It's
hot enough for me if the knob is all the way over to the hot side,
but not hot enough for my wife. I used to set the handle to more
or less the center, so something has changed. The downstairs
shower and all the rest of the faucets are fine so I don't think
it's the boiler (domestic coil).

I've replaced the cartridge in the Moen mixing/diverter valve (the
Moen site said either a 1220 or 1225 - I used a 1225) but the
problem remains. I've been told that a hot-cold transfer is
possible at any faucet so I've tried shutting off the supply to
them; nope. I would have thought this would affect all faucets
anyway. Any ideas?

--
Keith

hello Keith,

I would try seeing what hot water flow rate you get at the shower.

Put a small bucket under the shower and run only the hot water for a
timed minute .

That will show you if there is some constriction problem.

3.8GPM to the spigot (the shower head is more work)

Do the same for the cold water to compare.

4.3GPM

To followup: I measured the downstairs bath (working fine) and I
get 3.5GPM (hot) and 5.0GPM (cold). These number seem rather
reasonable to me.

--
Keith